For those of us fascinated with all things space but still broke enough that peanut butter and bread constitutes a reasonable lunch, there is good news! The International Space Station can actually be seen with the naked eye. How might one go about knowing where and when to look, you might ask? Well, tuck in, because the ISS Astroviewer has a chart full of times and locations. Sweeet!
via Reddit

Nasa also has this info here: http://spaceflight.nasa.gov/realdata/sightings/ci…
Or for those not in the United States: http://spaceflight.nasa.gov/realdata/sightings/in…
Or you can register at Heavens Above and see all the satellites that are passing over your location
http://www.heavens-above.com/